一种基于Shack-Hartmann传感器的自适应波前重建算法

J4 ›› 2013, Vol. 30 ›› Issue (4): 482-489.

一种基于Shack-Hartmann传感器的自适应波前重建算法

李战国李邦明李常伟张思炯

1中国科学院国家天文台南京天文光学技术研究所，江苏南京 210042; 2 中国科学院天文光学技术重点实验室，江苏南京 210042; 3 中国科学院大学，北京 100049

收稿日期:2012-09-10 修回日期:2012-11-21 出版日期:2013-07-28 发布日期:2013-07-06
通讯作者: 张思炯博士，研究员，主要从事自适应光学和光学成像技术方面的研究。 E-mail:sjzhang@niaot.ac.cn
作者简介:李战国（1987—）研究生，主要从事自适应光学系统波前探测方面的研究。Email: zgli001@126.com
基金资助:
中国科学院天文台站设备更新及重大仪器设备运行专项资助(Y0C0861000)、国家自然科学青年基金(11203052)

An Adaptive Algorithm for Wavefront Reconstruction Based on a Shack-Hartmann Sensor

LI Zhan-guo LI Bang-ming LI Chang-wei ZHANG Si-jiong

1 Nanjing Institute of Astronomical Optics and Technology，National Astronomical Observatories, Chinese Academy of Sciences, Nanjing 210042, China; 2 Key Laboratory of Astronomical Optics and Technology, Chinese Academy of Sciences, Nanjing 210042, China; 3 University of Chinese Academy of Sciences, Beijing 1000049, China ?

Received:2012-09-10 Revised:2012-11-21 Published:2013-07-28 Online:2013-07-06

摘要/Abstract

摘要： 波前重建是自适应光学系统中的一个重要环节，对系统性能影响明显。研究了一种无参考输入光条件下，基于Shack-Hartmann波前传感器的自适应波前重建算法，能根据实际光斑图的特点，自动确定探测窗口、计算实际质心、参考质心、选择重建区域和获取入射波前的Zernike模式系数，讨论了参考质心选择对波前重建结果的影响。搭建自适应光学系统，通过测量和校正模拟大气像差对重建算法进行了验证。实验结果表明，基于该重建算法的自适应光学系统可以把大气扰动引起的波前像差校正到0.1 λ以下，获得接近衍射极限的成像质量，说明该重建算法具有可靠性与实用性。

关键词: 自适应光学, 波前重建, 自适应算法, Shack-Hartmann波前传感器, 质心探测

Abstract: Wavefront reconstruction is of great importance in adaptive optics. Accuracy of the reconstruction has a significant effect on performances of an adaptive optics system. An adaptive algorithm for wavefront reconstruction based on a reference-free Shack-Hartmann wavefront sensor is proposed. In this approach information needed for wavefront reconstruction, including the detection windows, the actual centroids, the reference centroids, and the reconstruction area, can be automatically determined according to the characteristics of the obtained spot image of the Shack-Hartmann. The effects of different reference centroids on the reconstruction result of the incident aberrations are discussed. The reconstruction algorithm is experimentally verified by compensating phase distortion produced by artificial atmospheric turbulence in laboratory through an adaptive optics system. The experimental results show that wavefront aberrations caused by the atmospheric turbulence can be reduced to below 0.1 λ, which makes the quality of images close to the diffraction limit. The wavefront construction algorithm is an attractive and practical alternative to an adaptive optics system for telescopes.

Key words: adaptive optics, wavefront reconstruction, adaptive algorithm, Shack-Hartmann wavefront sensor, centroid detection

中图分类号:

O439
TN247

李战国李邦明李常伟张思炯. 一种基于Shack-Hartmann传感器的自适应波前重建算法[J]. J4, 2013, 30(4): 482-489.

LI Zhan-guo LI Bang-ming LI Chang-wei ZHANG Si-jiong. An Adaptive Algorithm for Wavefront Reconstruction Based on a Shack-Hartmann Sensor[J]. J4, 2013, 30(4): 482-489.

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